Geographic Information (Geographical Distribution Of Net Sales) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 68,009	$ 68,527	$ 67,094
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	47,460	49,687	48,769
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	11,019	6,634	6,834
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	8,187	10,901	9,641
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 1,343	$ 1,305	$ 1,850